animal tissue that constitutes the essential part of an organ as contrasted with e.g. connective tissue and blood vessels
2
the primary tissue of higher plants composed of thin-walled cells that remain capable of cell division even when mature; constitutes the greater part of leaves, roots, the pulp of fruits, and the pith of stems
双语例句
1
The secondary phloem consisted of sieve cells and phloem parenchymas.